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Title: Calibrating photometric redshifts of luminous red galaxies

Abstract

We discuss the construction of a photometric redshift catalogue of luminous red galaxies (LRGs) from the Sloan Digital Sky Survey (SDSS), emphasizing the principal steps necessary for constructing such a catalogue: (i) photometrically selecting the sample, (ii) measuring photometric redshifts and their error distributions, and (iii) estimating the true redshift distribution. We compare two photometric redshift algorithms for these data and find that they give comparable results. Calibrating against the SDSS and SDSS–2dF (Two Degree Field) spectroscopic surveys, we find that the photometric redshift accuracy is σ~ 0.03 for redshifts less than 0.55 and worsens at higher redshift (~ 0.06 for z < 0.7). These errors are caused by photometric scatter, as well as systematic errors in the templates, filter curves and photometric zero-points. We also parametrize the photometric redshift error distribution with a sum of Gaussians and use this model to deconvolve the errors from the measured photometric redshift distribution to estimate the true redshift distribution. We pay special attention to the stability of this deconvolution, regularizing the method with a prior on the smoothness of the true redshift distribution. The methods that we develop are applicable to general photometric redshift surveys.

Authors:
 [1];  [2];  [1];  [3];  [4];  [5];  [6];  [5];  [7];  [8];  [9];  [10];  [11];  [12];  [8];  [13];  [14];  [6];  [1];  [15] more »;  [16];  [2];  [17] « less
  1. Princeton Univ., Princeton, NJ (United States)
  2. Johns Hopkins Univ., Baltimore, MD (United States)
  3. Queen's Univ., Kingston, ON (Canada)
  4. Apache Point Observatory, Sunspot, MN (United States)
  5. Anglo-Australian Observatory, Epping, NSW (Australia)
  6. Univ. of Pittsburgh, Pittsburgh, PA (United States)
  7. Eotvos Univ., Budapest (Hungary)
  8. Univ. of Queensland (Australia)
  9. Steward Observatory, Tucson, AZ (United States)
  10. Institute of Astronomy, Cambridge (United Kingdom)
  11. Univ. of Sussex, Brighton (United Kingdom)
  12. Univ. of Portsmouth, Portsmouth (United Kingdom)
  13. Australian National Univ., Weston, ACT (Australia)
  14. Pennsylvania State Univ., University Park, PA (United States)
  15. Univ. of Durham, Durham (United Kingdom)
  16. Institute of Astronomy, Honolulu, HI (United States)
  17. Carnegie Mellon Univ., Pittsburgh, PA (United States)
Publication Date:
Research Org.:
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Sponsoring Org.:
USDOE Office of Science (SC), High Energy Physics (HEP) (SC-25)
OSTI Identifier:
1379844
Grant/Contract Number:  
AC02-05CH11231
Resource Type:
Accepted Manuscript
Journal Name:
Monthly Notices of the Royal Astronomical Society
Additional Journal Information:
Journal Volume: 359; Journal Issue: 1; Journal ID: ISSN 0035-8711
Publisher:
Royal Astronomical Society
Country of Publication:
United States
Language:
English
Subject:
79 ASTRONOMY AND ASTROPHYSICS; catalogues; surveys; galaxies: fundamental parameters

Citation Formats

Padmanabhan, Nikhil, Budavari, Tamas, Schlegel, David J., Bridges, Terry, Brinkmann, Jonathan, Cannon, Russell, Connolly, Andrew J., Croom, Scott M., Csabai, Istvan, Drinkwater, Michael, Eisenstein, Daniel J., Hewett, Paul C., Loveday, Jon, Nichol, Robert C., Pimbblet, Kevin A., De Propris, Robert, Schneider, Donald P., Scranton, Ryan, Seljak, Uros, Shanks, Tom, Szapudi, Istvan, Szalay, Alexander S., and Wake, David. Calibrating photometric redshifts of luminous red galaxies. United States: N. p., 2005. Web. doi:10.1111/j.1365-2966.2005.08915.x.
Padmanabhan, Nikhil, Budavari, Tamas, Schlegel, David J., Bridges, Terry, Brinkmann, Jonathan, Cannon, Russell, Connolly, Andrew J., Croom, Scott M., Csabai, Istvan, Drinkwater, Michael, Eisenstein, Daniel J., Hewett, Paul C., Loveday, Jon, Nichol, Robert C., Pimbblet, Kevin A., De Propris, Robert, Schneider, Donald P., Scranton, Ryan, Seljak, Uros, Shanks, Tom, Szapudi, Istvan, Szalay, Alexander S., & Wake, David. Calibrating photometric redshifts of luminous red galaxies. United States. doi:10.1111/j.1365-2966.2005.08915.x.
Padmanabhan, Nikhil, Budavari, Tamas, Schlegel, David J., Bridges, Terry, Brinkmann, Jonathan, Cannon, Russell, Connolly, Andrew J., Croom, Scott M., Csabai, Istvan, Drinkwater, Michael, Eisenstein, Daniel J., Hewett, Paul C., Loveday, Jon, Nichol, Robert C., Pimbblet, Kevin A., De Propris, Robert, Schneider, Donald P., Scranton, Ryan, Seljak, Uros, Shanks, Tom, Szapudi, Istvan, Szalay, Alexander S., and Wake, David. Sun . "Calibrating photometric redshifts of luminous red galaxies". United States. doi:10.1111/j.1365-2966.2005.08915.x. https://www.osti.gov/servlets/purl/1379844.
@article{osti_1379844,
title = {Calibrating photometric redshifts of luminous red galaxies},
author = {Padmanabhan, Nikhil and Budavari, Tamas and Schlegel, David J. and Bridges, Terry and Brinkmann, Jonathan and Cannon, Russell and Connolly, Andrew J. and Croom, Scott M. and Csabai, Istvan and Drinkwater, Michael and Eisenstein, Daniel J. and Hewett, Paul C. and Loveday, Jon and Nichol, Robert C. and Pimbblet, Kevin A. and De Propris, Robert and Schneider, Donald P. and Scranton, Ryan and Seljak, Uros and Shanks, Tom and Szapudi, Istvan and Szalay, Alexander S. and Wake, David},
abstractNote = {We discuss the construction of a photometric redshift catalogue of luminous red galaxies (LRGs) from the Sloan Digital Sky Survey (SDSS), emphasizing the principal steps necessary for constructing such a catalogue: (i) photometrically selecting the sample, (ii) measuring photometric redshifts and their error distributions, and (iii) estimating the true redshift distribution. We compare two photometric redshift algorithms for these data and find that they give comparable results. Calibrating against the SDSS and SDSS–2dF (Two Degree Field) spectroscopic surveys, we find that the photometric redshift accuracy is σ~ 0.03 for redshifts less than 0.55 and worsens at higher redshift (~ 0.06 for z < 0.7). These errors are caused by photometric scatter, as well as systematic errors in the templates, filter curves and photometric zero-points. We also parametrize the photometric redshift error distribution with a sum of Gaussians and use this model to deconvolve the errors from the measured photometric redshift distribution to estimate the true redshift distribution. We pay special attention to the stability of this deconvolution, regularizing the method with a prior on the smoothness of the true redshift distribution. The methods that we develop are applicable to general photometric redshift surveys.},
doi = {10.1111/j.1365-2966.2005.08915.x},
journal = {Monthly Notices of the Royal Astronomical Society},
number = 1,
volume = 359,
place = {United States},
year = {2005},
month = {5}
}

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